Roentgen tube.



PATENTED 001. 18, 1904.

0. H. P. MULLER.

ROENTGEN TUBE.

APPLICATION IIL N0 MODEL.

UNITED STATES Patented October 18, 1904.

CARL HEINRICH FLORENZ MlilLLER, F HAMBURG, GERMANY.

ROENTGEN TUBE.

SPEGTFICATION forming part of Letters Patent No. 772,666, dated October 18, 1904. Application filed November 22, 1902. Serial No, 132,427. (No model.)

To all whom it may concern/.2

Be it known that I, CARL HEINRICH FLoRnNz MULLER, a subject of the German Emperor, and a resident of Hamburg, in the German Empire, have invented certain new and useful H Improvements Relating to Roentgen Tubes,

of which the following is a specification.

Although many Roentgen tubes have already been constructed with multiple cathodes, these latter have invariably hitherto been similar and similarly arrangedas, for example, in the tubes for stereoscopic purposes. As, however, Roentgen tubes have latterly been employed for a number of purposessuch', for example, as the production of Roentgen pictures and also for treating skin diseases, &c.the form or arrangement of the cathodes in the latter cases should preferably be quite different from the first-named case. Obviously, therefore, it would be advantageous to give to one and the same tube aform suitable for both purposes and to provide such tube with two or more cathodes of different formation or with the same formation, arranging them differently in the tube, or, finally, differently arranging cathodes of varying formation. As regards the second method it is possible to obtain with two exactly-similar cathodes in the same tube Roentgenrays of quite different penetrative capacities by arranging the operative faces of these cathodes at varying distances from the point of junction of the central sphere ofthe apparatus with the respective tubular annexes. If then the face in closer proximity to the sphere is employed as cathode, the tube will be much weaker than if the other face were used, so that, for example, the apparatus would be suited in the first case for taking pictures of the hand and in the second case for representations of the pelvis. It is not,

however, necessary that the two cathodes.

should be diametrically opposite one to the other, although this position presents the advantage that one and the same anticathode may be employed for both, and this without the scope of the radiation of the Roentgen rays produced in either case being limited by the cathode, which is inoperative for the time 5 being. It is also evident that the intensity and penetrability of the rays from either cathode-terminal may be regulated by merely regulating the distance of said terminal from'the anticathode-surface, and if the point of focus of the concave reflector is placed at a point considerably removed from the anticathodesurface the rays thus produced .will be of less intensity than if the cathode were focused di' rectly upon the anticathode.

In the accompanying drawings, Figure 1 is a longitudinal central section of a Roentgen tube made in accordance with and embodying my invention. Fig. 2 is a similar section showinga modification of my improved Roentgen tube; and Fig. 3 is a horizontal sectional vieW on the line A B, Fig. .2.

Similar letters refer to similar parts throughout the several views.

The Roentgen tubes shown in the figures have two cathodes f and f 2 of unlike formation, and in this case one cathode-face, f is of less pronounced curvature than the other cathode-face, f. The first, the cathode-rays .of which are not brought to a sharp focus, is

adapted for the therapeutic uses of Roentgen rays above specified, while the latter is suited for the production of Roentgen pictures or radiographs. In this case the arrangement of these cathodes may be either similar or dissimilar.

The anticathode a is available for both cathodes.

Having fully described myinvention, what I claim, and desire to secure by Letters Patent, is

1. A vacuum-tube having an anticathode and a plurality of cathodes therein, said cathodes being provided with focusing-reflectors arranged at different distances from the rcflecting-surfaces of the-anticathode, substantially as described.

2. A vacuum-tube having anticathode and a plurality of cathode-terminals located therein, said cathode-terminals being arranged so as toproduce rays of different penetrative power, substantially as described.

3. A vacuum-tube, having an anticathode and a plurality of cathode-terminals located therein, said cathode-terminals being provided with focusing-reflectors of different form and adapted to produce rays of different penetrative power, substantially as described.

4. A vacuum-tube having an anticathode and a plurality of cathodes located therein. a plurality of focusing-reflectors rnounted upon said cathode and of different focal distances and located at different distances from the reflecting-surface of the anticathode so as to produce rays of different penetrative power, substantially as described.

5. A Roentgen tube comprising an anticathode-chamber, cathode-chambers branching therefrom and cathodes therein adapted to produce rays of different penetrative power; in combination with an anticathode in said anticathode-chamber common to all the cathodes, substantially as set forth.

6. A vacuum-tube having anticathode and a plurality of cathode-terminals located therein, said cathode-terminals being provided with focusing-reflectors having their respective focal points at different distances from the reflecting-surfaces of the anticathode, substantially as described.

7. A vacuum-tube having an anticathede and a plurality of cathode-terminals located therein, said cathodeter1ninals being provided with focusing-reflectors having different degrees of concavity, substantially as described.

CARL HEINRICH FIAOPLENZ lllUllllER. \Vitnesses:

l\lAX KAEMPFF, E. H. L. MUMMuNnoFF. 

